I.c. acc. pers. et inf., δεῖ τινὰ ποιῆσαι it is binding on one to do a thing, one must, one ought, Lat. oportet, Hom., etc.:—rarely, δεῖ σε ὅπως δείξεις ῀ δεῖ σε δεῖξαι, Soph.: —rarely also c. dat. pers. et inf., there is need for one to do, δεῖ τινὶ ποιήσαι Eur., Xen.
2.c. acc. rei et inf., δεῖ τι γενέσθαι Thuc., etc.:—for the phrase οἴομαι δεῖν, v. οἴομαι:— when used absol., an inf. may be supplied, μὴ πεῖθ᾽ ἃ μὴ δεῖ (sc. πείθειν) Soph., etc.
II.(from δέω2, to want), c. gen. rei, there is need of, there is wanting, Lat. opus est re, οὐδὲν δεῖ τινός Hdt., attic:—phrases, πολλοῦ δεῖ there wants much, far from it; ὀλίγου δεῖ there wants little, all but:— in answers, πολλοῦ γε δεῖ, πολλοῦ γε καὶ δεῖ far from it, Ar., Dem.; πλεῦνος δεῖ it is still further from it, Hdt:— ὀλίγου δεῖν absol., in same sense, Plat.; μικροῦ δεῖν Dem.
